Originally Posted by AustinJerry
Originally Posted by kbarnes701
That 'hump' is always present since using REW - it is on every graph I have made. Yes, it is an average. There is, AFAIK, no way to test three channels simultaneously. I am not even sure if the 'average' (used in this way) is of any use. I included it to spark off the discussion really.
I can see the value of averaging several different mic placement measurements of 1 channel - but not sure if the way I did it has any value. All comments gratefully received ;)
Well, time to leverage REW to get at the root cause. I would focus on the following set of measurements only from 15-300Hz, no smoothing. Also recommend Prog1 on the subs, if that is what you were running when you calibrated.
OK - that is easy enough. 15-300 is what I was looking at here for the evaluation of the splice, no smoothing. After evaluation of the various distance settings, it became obvious that the ones I was already using (10.6 and 9.6 ft) were still the best (no reason to believe otherwise as no speaker/sub changes have been made - I just wanted to see that REW gave me the same result as M, which it did). Consequently I just posted the full spectrum to show the difference (alleged) that changing the XO made.
It doesn't really matter if I use Pgm1 or Pgm 2 because the difference between them is always totally consistent and very simple. Here it is, graphed, no smoothing 15-300Hz. Pgm2 simply raises the level by a predictable amount. In the graph, the brown line is, obviously, Pgm 2. As you can see, nothing above about 50Hz is changed.
This raises another, general, question. Other than for comparison purposes between state A and state B, (eg Audyssey ON, Audyssey OFF) I can't really see the point in measuring the system in a way in which I will never actually use it. Because I always use Pgm2, I measure with Pgm2 engaged, same as I measure with Audyssey engaged. Is this not right?
Sub1 only, Audyssey off and on
- Sub2 only, Audyssey off and on
- Both subs, Audyssey off and on
- Both subs + Left + Right, Audyssey off and on
- Both subs + Center, Audyssey off and on
I already have those measurements - they are the ones recommended in your Guide are they not? But again, other than to get a feel for what Audyssey is actually doing, what's the point of measuring with Audyssey off in order to try to determine the best sub delays for splice optimisation?
Rather than post a bunch of graphs, have you set up an account on a file-sharing site like DropBox where you can post the MDAT file? I would like to take a stab at analyzing the data, rather than nickel-and-dime you to death with different graph requests.
Sure. I have a Dropbox account. I will upload the mdat file to it for you to look at. Will post the url for you later.
And as far as your averaging question, I think averaging is best used for multiple mic locations of the same speaker(s). When you average different speaker resounses with one mic position, you are simply masking the different responses, which is what you don't want to do. IMHO, of course.
OK - that is what I thought in reality. Thanks.